BioMedical Admissions Test (BMAT) Practice Test 2026 - Free BMAT Practice Questions and Study Guide

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What effect does exhalation have on thorax volume?

It increases thorax volume

It decreases thorax volume

Exhalation is the process of breathing out air from the lungs, and during this process, the thorax volume decreases. This decrease occurs due to the relaxation of the diaphragm and the intercostal muscles, which leads to a reduction in the size of the thoracic cavity. As the thorax volume reduces, the pressure within the thoracic cavity increases relative to the atmospheric pressure, causing air to be expelled from the lungs. This mechanism is crucial for effective breathing and the exchange of gases in the respiratory system, enabling carbon dioxide to be removed and fresh oxygen to be taken in during inhalation. Understanding this fundamental aspect of respiratory physiology is important for grasping how the mechanics of breathing function.

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It has no effect on thorax volume

It allows for air to enter the lungs

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